In his interpretations of Aristotle (1921-27), Heidegger argues that the ontological model of poiēsis (Herstellung, production, understood as bringing something into being by way of craftsmanship or art) played an essential part in the development of all major concepts of Greek metaphysics. The being of man and nature were understood in the light of the being of the produced things (erga), which Heidegger calls Vorhandensein (ousia). We will show here how Heidegger interprets three central words of Aristotle’s philosophy: technē (the knowledge which guides all steps of production), eidos (the aspect of the thing to be produced) and logos (the uncovering and bringing-together of all the characters which constitute the aspect)